how to add changes to and existing repository in github code example

Example 1: how to add an existing project to github

# Go into your existing directory and run below commands
cd docker-spring-boot
echo "# docker-spring-boot" >> README.md
git init
git add -A
git commit -m "first commit"
git branch -M master
git remote add origin https://github.com/devopsmaster/docker-spring-boot.git
git push -u origin master

Example 2: how to push a file to github

git remote add origin 'your_url_name'

git push -u origin master

Example 3: initialize a repo and push to github

git init
git add -A
git commit -m 'Added my project'
git remote add origin [email protected]:sammy/my-new-project.git
git push -u -f origin master